Journal of South China University of Technology (Natural Science Edition) ›› 2008, Vol. 36 ›› Issue (11): 134-137.

• Materials Science & Technology • Previous Articles     Next Articles

Effects of Preparation Conditions on NOx Storage Capacity of Perovskite-Type BaZrO3

Gao Ai-mei  Wang Zhou-feng   

  1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2008-04-18 Revised:2008-05-05 Online:2008-11-25 Published:2008-11-25
  • Contact: 高爱梅（1979-），女，博士后，助理研究员，主要从事材料物理化学研究． E-mail:amgao@seut．edu．cn
  • About author:高爱梅（1979-），女，博士后，助理研究员，主要从事材料物理化学研究．
  • Supported by:

    中国博士后基金资助项目（20060400747）

PDF

1004

Abstract:

Perovskite-type BaZrO3 catalysts were prepared by means of a modified citric acid complex sol-gel method. Then, the effects of calcination temperature, adsorption temperature and SO2 concentration on the NOx storage capacity （NSC） of BaZrOz in the presence of excess oxygen were investigated. Moreover, a temperature-programmed desorption （TPD） of adsorbed NOx was performed and the BET surface area and XRD techniques were used to reveal the structure of perovskite-type BaZrO3  and to investigate its influence on performance. The results indicate that, as compared with the BaZrO3  calcinated at 900 ℃, the catalyst ealcinated at 750℃ possesses much higher BET surface area （ 84. 0m^2/g） and greater NSC, that BaZrO3  is the main absorption center of NOx, and that the optimum temperature for NO/storage by BaZrO3  is about 400 ℃.

Key words: perovskite-type BaZrO3, NOx storage capacity, temperature-programmed desorption